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Publication date: Oct 09, 2024
The performance of Ni-based oxygen evolution reaction (OER) electrocatalysts is enhanced upon Fe incorporation into the structure or Fe uptake from the electrolyte. In light of the promising potential of metal-organic framework (MOF) electrocatalysts for water splitting, Ni-MOF-74 is used as a model catalyst to study the effect of Fe incorporation from KOH electrolyte on the electrocatalyst’s OER activity and stability. The insights obtained from X-ray diffraction and operando X-ray absorption spectroscopy characterizations of Ni-MOF-74 and an amorphous Ni metal organic compound (Ni-MOC*) reveal that Fe uptake enhances OER by two processes: higher Ni oxidation states and enhanced flexibility of the electronic state and local structure when cycling the potential below and above the OER onset. To demonstrate the impressive OER activity and stability in Fe containing KOH, an Ni-MOC* anode was implemented in an anion exchange membrane water electrolyzer (AEM-WE) with 3 ppm Fe containing 1 M KOH electrolyte resulting in an outstanding cell voltage of 1.7 V (at an anode potential of 1.51 V) at 60 °C and 0.5 A cm-2 exceeding 130 h of stable continuous operation.
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File name | Size | Description |
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Figure 1.zip
MD5md5:8ab488df6cfad6dcd3788668b8eab4e4
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72.1 KiB | OER performance of Ni-MOF-74 and its Fe uptake from Fe-containing 0.1 M KOH |
Figure 2.zip
MD5md5:875ba427cd29ebb235d6a7eaadfa46b9
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263.2 KiB | Ex situ XRD and operando hXAS measurements of Ni-MOF-74 in Fe-free and 5 ppm Fe contaminated 0.1 M KOH electrolyte |
Figure 3.zip
MD5md5:bf5d3e13c57bf2683d54e18359abf5f9
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69.2 KiB | Activity and Stability of Ni-MOC* upon Fe incorporation from Fe-containing 0.1 M KOH electrolyte |
Figure 4.zip
MD5md5:bc9d5f65c15b9259880aad50823353e8
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123.3 KiB | Operando hXAS measurements of Ni K edge of Ni-MOC* during OER in clean and 5 ppm Fe contaminated 0.1 M KOH |
Figure 5.zip
MD5md5:5a11475e29d240ba40df3d04baacbac1
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8.1 MiB | Performance of Ni-MOC* anode in AEM-WE in Fe-free and 3 ppm Fe contaminated 1 M KOH |
2024.151 (version v1) [This version] | Oct 09, 2024 | DOI10.24435/materialscloud:q2-rd |